KR101644784B1 - Apparatus and Method for Control Gap between Precast Slab and Ground Surface - Google Patents

Abstract

The present invention relates to an apparatus for controlling a height of a precast slab which can conveniently change a gap between a precast slab and the ground surface to a desired degree when needed after installing the precast slab and separating the precast slab from the ground surface for a concrete pavement or other various purposes to readjust an installation height of the precast slab. According to the present invention, the apparatus for controlling a height of a precast slab comprises a burying nut (1), a height control bolt (2), a driver insertion pipe (3), and an anchor bolt (5). A hollow insertion unit (20) of the height control bolt (2) is inserted and screw-mounted in a lower portion of a hollow space (10) of the burying nut (1) to support a precast slab (200) and vertically separate the precast slab (200) from the ground surface. While the precast slab (200) is separated from the ground surface (300), a rotary driver is inserted through the driver insertion pipe (3) to rotate the height control bolt (2) by rotation of the rotary driver (30) while gear teeth of the rotary driver (30) are meshed with gear teeth of a rotary drive unit (21) to move in a vertical direction to adjust and maintain an installation height of the precast slab (200) to a designed height.

Description

TECHNICAL FIELD [0001] The present invention relates to a pre-cast slab height adjustment apparatus capable of height adjustment and a pre-cast slab height adjustment method using the pre-cast slab height adjustment apparatus.

The present invention relates to a device for adjusting the height of a precast slab, which enables a gap between a precast slab and a ground to be readjusted to a desired degree when necessary, and more particularly to a device for adjusting the height of a precast slab, The present invention relates to a precast slab height adjustment apparatus for accurately adjusting the installation height of a precast slab by changing a gap between a precast slab and a ground to a desired degree whenever necessary after a post installation .

In the conventional method of replacing old aged asphalt pavement or concrete pavement, there is a method of removing old aged pavement and installing a plurality of precast slabs continuously in the direction of the road in the place. In this conventional method, after the existing package is removed, the newly installed precast slab is disposed in a state in which the installation height thereof is adjusted with spacers spaced from the ground by spacers such as steel plates. After the installation height of the precast slab (the height of the top surface of the precast slab) is adjusted to a necessary degree, a filler such as mortar is injected into all or a part of the vertical interval between the lower surface of the precast slab and the ground, Thereby maintaining the installation height of the slabs permanently. As an example of such a conventional technique, Korean Patent Laid-Open Publication No. 10-2015-57581 discloses a technique of precisely applying a precast slab to a desired installation height by using a level adjustment device. According to Korean Patent Laid-Open Publication No. 10-2015-57581, a precast slab is installed so as to have an installation height designed irrespective of the irregularity of the ground, so that the road can be repaired. Of course, the technique disclosed in Korean Patent Laid-Open Publication No. 10-2015-57581 can also be used for packaging of new roads.

When a precast slab is installed at a vertical interval from the ground, if the height of the ground changes due to subsidence or the like after the precast slab is installed at the designed installation height, the installation height of the precast slab . If the installation height of some precast slabs in the road pavement changes, there will be a problem that stepped roads occur on the road surface or deformation occurs at the end of the road. However, in the conventional techniques up to now, there is no practical and effective method for adjusting the installation height of the precast slab after the completion of installation and installation of the precast slab so that it can be adjusted to a desired level afterwards. Therefore, when the installation height of the precast slab is changed due to the height change of the ground as described above, it is inevitably necessary to remove the precast slab and reinstall the new precast slab or to perform the concrete overlaying on the top surface of the precast slab. In the case of removing the precast slab and reinstalling it, there is a disadvantage that a lot of time and expense must be added due to the rework. In the case of overlaying the top surface of the precast slab, Concrete can easily fall off.

Korean Patent Publication No. 10-2015-0057581 (published on May 28, 2015).

The present invention has been developed in order to overcome the limitations and disadvantages of the prior art as described above, and it is an object of the present invention to provide a precast slab, which is vertically spaced from the ground for pavement construction on a new road, The installation height of the precast slab can be precisely adjusted through a work from the top surface of the precast slab. Especially, even when the installation of the precast slab is completed, when the height of the ground changes due to subsidence, And it is an object of the present invention to provide a technique capable of realigning the installation height of the precast slab to a desired degree through work from the upper surface.

In order to achieve the above object, according to the present invention, there is provided a buried nut, which is vertically erected and embedded in a precast slab, and has an inner surface with a hollow formed with a threaded portion; A hollow insertion portion and a rotation driving portion integrally provided at a lower end portion of the hollow insertion portion and having a gear tooth portion formed on a lateral side thereof; a height adjusting bolt having a central through hole formed at a central portion thereof to penetrate both the hollow insertion portion and the rotation driving portion, ; A driver inserting pipe formed of a pipe member and erected in a vertical direction and integrally embedded in the precast slab; And an anchor bolt which is vertically installed and fixedly installed on the ground, and inserted through the hollow and the central pipe passage; The hollow insertion portion of the height adjusting bolt is inserted and screwed into the hollow bottom portion of the buried nut to support the precast slab at a vertical interval from the ground; In a state in which the precast slab is spaced from the ground, a rotation driver is inserted through the driver insertion tube, and the height adjustment bolt is rotated by the rotation of the rotation driver in a state where the gear teeth of the rotation driver are engaged with the gear teeth of the rotation drive And the height of the pre-cast slab is adjusted and maintained to be the designed height.

In the precast slab height adjusting apparatus according to the present invention, the driver insertion tube may be provided in a state of being closely attached to the side surface of the buried nut, and the screw portion may be damaged when the anchor bolt is inserted through the hole In order to prevent anchor bolts from buckling, the anchor bolts are placed on the anchor bolts when the anchor bolts are inserted through the holes in the hollow and central pipes. Then, the anchor bolts are inserted through the holes in the hollow and central pipes and the precast slabs The anchor cap may be further assembled to the upper end of the anchor cap so that the lower end of the anchor cap has a flat top surface and a tapered shape toward the upper end of the anchor cap. .

In the height adjusting device of the precast slab according to the present invention as described above, a plate-shaped member having a thickness in the vertical direction is formed, and a center hole through which the anchor bolt passes is formed at the center. The support block may further include a support block for distributing the load from the precast slab, which is transmitted through the height adjustment bolt, to the ground by closely contacting the rotation drive portion of the bolt to the upper surface. In this case, The upper surface is a concave curved surface; And a lower surface of the rotary drive unit which is in close contact with the support block is formed of a convex curved surface having a curvature equal to the curvature of the concave curved upper surface of the support block.

According to the present invention, in arranging the precast slab at a vertical interval from the ground, the installation height of the precast slab can be precisely adjusted to a desired degree through work from the top surface of the precast slab, The installation height of the precast slab can be readjusted to a desired level through work from the top surface of the precast slab at any time when the height of the ground changes due to subsidence or the like.

Particularly, in the present invention, when the precast slab is placed on the ground at intervals, the worker inserts the rotary driver at the top surface position of the precast slab and rotates the rotary driver so that the height- It is possible to adjust the installation height of the precast slab finely and precisely by adjusting the degree of rotation of the rotary screwdriver at any time, if necessary, so as to exactly match the design matters, There is an advantage that precise adjustment work on the design height can be performed very easily.

Above all, in the present invention, when the installation height of the precast slab is changed due to settlement or rises of the ground, the operator can easily access the gap between the ground and the precast slab, The installation height of the precast slab can be restored to the designed position at the time of the original construction, and therefore, the maintenance of the precast slab can be performed very quickly and conveniently.

FIG. 1 is a schematic perspective view showing a state in which a precast slab is installed on a ground surface at intervals using a height adjusting device of a precast slab according to an embodiment of the present invention.
2 is a schematic exploded perspective view of a height adjusting device of a precast slab according to an embodiment of the present invention.
3 is a schematic half cross-sectional perspective view along line AA of FIG. 1 showing the construction of a height adjusting device of a precast slab according to the present invention.
4 is a half sectional perspective view of the precast slab height adjusting device according to the present invention, taken along the line BB of FIG.
5 is a schematic assembled perspective view showing a state in which a height adjusting bolt and a buried nut provided in a height adjusting device of a precast slab according to the present invention are combined.
6 is a schematic half cross-sectional perspective view taken along the line CC of FIG.
Fig. 7 is a schematic exploded perspective view corresponding to Fig. 2 for another embodiment of the present invention in which the height adjusting bolt and the support block are made of one member.
8 is a schematic half cross-sectional perspective view according to line DD of FIG.
9 is a schematic perspective view showing a state in which an anchor cap is put on an anchor bolt in the present invention.
10 is a schematic half cross-sectional perspective view according to line EE of FIG.
11 is a schematic half cross-sectional perspective view showing a state after the anchor bolt is covered with the anchor bolt.
Figure 12 is a schematic enlarged view of the circle F portion of Figure 1;
FIG. 13 is a schematic cross-sectional view illustrating the installation of an anchor bolt and the installation of a support block in a process of installing a precast slab using the height adjusting device of the present invention.
FIG. 14 is a schematic half cross-sectional perspective view showing a state in which a precast slab is lifted and mounted on a ground using a height adjusting device of the present invention. FIG.
Fig. 15 is a schematic cross-sectional view sequentially showing a state of Fig. 14 and a state in which a post-precast slab is completely mounted.
16 is a schematic half cross-sectional perspective view showing the state where the pull-up jack device is coupled to the buried nuts in the present invention.
Fig. 17 is a schematic cross-sectional view showing the state of Fig. 16 and a state in which a precast slab is pulled up using an impression jack device thereafter. Fig.
Fig. 18 is a schematic semi-sectional perspective view showing insertion of a rotary driver into a driver insertion tube in a state where the precast slab is pulled up following the state of Fig. 17;
FIG. 19 is a schematic cross-sectional view showing a state in which the height adjusting bolt is advanced downward by the rotation of the rotating screw following the state of FIG. 18;
FIG. 20 is a schematic cross-sectional view sequentially showing a process that follows the state shown in FIG.
Fig. 21 is a schematic half-sectional perspective view showing a state in which the finish cap is covered after the state shown in Fig. 20 (a). Fig.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby. Particularly, in the present specification, it is described that the precast slab is installed at a vertical interval from the "ground ". Here," ground "does not mean only the upper surface of the ground composed of gravel, but also the upper surface of the concrete foundation, As well as the upper surface of the lower base portion made of various materials. In this specification, "vertical direction" means the thickness direction of the precast slab.

1, a precast slab 200 is placed on a floor 300 using a height adjusting device 100 (hereinafter abbreviated as "height adjusting device") of a precast slab according to an embodiment of the present invention. There is shown a schematic perspective view showing a state of installation and installation. FIG. 2 is a schematic exploded perspective view of a height adjusting apparatus 100 of the present invention, and FIGS. 3 and 4 show schematically a half section of the height adjusting apparatus 100 of the present invention shown in FIG. FIG. 3 is a perspective view of a half cross-sectional view taken along line AA of FIG. 2, and FIG. 4 is a half-sectional perspective view taken along line BB of FIG. 5 is an assembled perspective view of a height adjusting device 100 according to the present invention in which a buried nut 1 and a height adjusting bolt 2 are combined. FIG. 6 is a schematic cross- Are shown.

The buried nuts 1 are vertically erected and embedded in the precast slab 200. A hollow 10 is formed in the buried nut 1 and a protrusion 11 is formed at an intermediate position in the hollow interior of the buried nut 1 so that the cross section of the hollow 10 is narrowed. Therefore, a step is formed by the protruding portion 11, and a nut member to be fastened to the upper end of the anchor bolt 5 is disposed on the upper surface of the protruding portion 11, which will be described later. A screw portion is formed on the inner surface of the hollow 10 at the vertical upper portion and the vertical lower portion about the protruding portion 11. Since the buried nuts 1 are buried in the precast slabs, a shear connection part 12 is provided on the outer surface of the buried nuts 1 so as to be integrated with a material (for example, concrete) constituting the precast slab desirable. The shear connection part 12 has a ring shape and a plurality of shear connection parts 12 are provided in the illustrated embodiment, but the shape of the shear connection part 12 is not limited thereto and may be variously changed. In addition, as a method for embedding the buried nuts 1 integrally in the precast slab 200, various methods such as roughening the surface of the buried nuts 1 in addition to forming the shear connection portions 12 as described above may be used Can be used.

The height adjusting device 100 of the present invention is provided with a driver insertion tube 3 for inserting a rotation driver 30 for rotating the height adjusting bolt 2. The driver insertion tube 3 is formed of a pipe member which is elongated in the vertical direction and hollow and hollow in the vertical direction so as to pass through the precast slab 200 in the same manner as the buried nut 1 and is inserted into the precast slab 200 And is embedded in a single body. In particular, as illustrated in the drawing, the driver insertion tube 3 may be provided in a state of being in close contact with the side surface of the buried nut 1. [ When the driver insertion tube 3 is closely attached to the side surface of the buried nut 1 as described above, the buried nut 1 and the driver insertion tube 3 form a single assembly, And it is possible to prevent the diameter of the rotation driving part 21 from becoming excessively large when the gear teeth of the rotation driving part 21 and the gear teeth of the rotation driver 30 are engaged as described later .

The height adjusting bolt 2 is a member inserted into the vertical lower portion of the hollow 10 of the buried nut 1 in a screwed manner and vertically moves up and down in the lower direction of the concrete slab to adjust the height of the concrete slab, The load applied from the precast slab 200 is transmitted to the ground while the slab 200 is supported at a vertical interval from the ground. In the present invention, the height adjusting bolt 2 includes a cylindrical hollow insertion portion 20 and a rotation driving portion 21 integrally provided at the lower end of the hollow insertion portion 20. A central pipe through-hole 22 is formed at the central portion so as to pass through both the hollow insertion portion 20 and the rotation drive portion 21, through which the anchor bolt 5 is inserted.

The hollow insertion portion 20 has a threaded portion formed on its outer surface and is inserted into the hollow portion 10 of the buried nut 1 in a screwed state on the vertical lower portion. The rotary drive part 21 is formed continuously to the lower end of the hollow insertion part 20 and has a diameter larger than the diameter of the hollow insertion part 20, and a gear tooth part is formed on the lateral side thereof. The gear teeth portion 31 formed at the lower end portion of the rotary driver 30 inserted through the driver insertion tube 3 and the gear teeth portion of the rotary drive portion 21 are engaged with each other and the rotary driver 30 is rotated The rotation drive portion 21 rotates about the center pipe through hole 25 as a rotation axis by the engagement between the gear teeth portions so that the hollow insertion portion 20 is screwed into the hollow of the fillet nut 1, 1) or in the hollow of the buried nut (1).

In the present invention, the support block 4 may further be provided at a position below the rotation driving part 21. [ The support block 4 is a member for laying on and transmitting the load from the precast slab transferred through the height adjustment bolts 2 to the ground. The support block 4 is formed of a plate-shaped member having a thickness in the vertical direction, and a central hole 40 through which the anchor bolts 5 pass is formed at the center. When the support block 4 is provided as a separate member separate from the height adjusting bolt 2, the lower surface of the rotation driving unit 21 is brought into close contact with the upper surface of the support block 4, The rotation driving portion 21 of the height adjusting bolt 2 and the supporting block 4 are brought into close contact with each other so that the height adjusting bolt 2 is stably mounted on the supporting block 4 It is preferable that the upper surface of the support block 4 is made of a concave curved surface. At this time, the lower surface of the rotary drive part 21 is also formed of a convex curved surface so as to have a curvature equal to the curvature of the concave curved upper surface of the support block 4. When the support block 4 is separated from the rotation driving unit 21 and is provided as a separate member, when the rotation driving unit 21 is rotated to adjust the installation height of the precast slab 200, The rotation driving unit 21 can be easily rotated. This is because the friction between the rotation driving part 21 and the supporting block 4 is smaller than the friction between the supporting block 4 and the ground so that the rotation driving part 21 is in a state in which the supporting block 4 is in close contact with the ground It is easy to rotate.

However, when the axis of the ground and the height adjusting bolt 2 are exactly perpendicular or perpendicular to each other within a negligible error range, the supporting block 4 may be integrally formed with the height adjusting bolt 2. 7 is a schematic exploded view corresponding to FIG. 2 for the case where the support block 4 is integrally provided under the rotation driving portion 21 and the height adjustment bolt 2 and the support block 4 are formed as a single member. And FIG. 8 is a schematic half cross-sectional perspective view taken along the line DD of FIG. 7 and 8, the height adjusting bolt 2 and the support block 4 are made of one member, but the diameter of the support block 4 is larger than the diameter of the rotation drive portion 21 , The rotation driving portion 21 and the support block 4 may have the same diameter. In this case, the support block 4 is omitted.

In the above description, the support block 4 having a diameter larger than that of the rotation drive part 21 is provided below the rotation drive part 21 of the height adjustment bolt 2, but such a support block 4 is omitted. It is possible. For example, by increasing the diameter of the rotation driving unit 21, the area of the rotation driving unit 21 contacting the ground surface may be increased so that the load may be dispersed and transmitted to the ground surface. Since the support block 4 is separately provided from the rotation drive part 21 in various aspects, the support block 4 is separately described in the following description.

The anchor bolt 5 is disposed so as to pass through the height adjusting bolt 2 and the support block 4. [ The anchor bolt 5 is a rod-like member whose lower end is penetratively fixed to the ground and is vertically erected. The upper surface of the anchor bolt 5 has a threaded portion. The upper end of the anchor bolt 5 is protruded above the protrusion 11 in a state where the anchor bolt 5 is installed so as to extend through the height adjusting bolt 2 and the support block 4 as described later, A nut member (51) is fastened to the upper end of the anchor bolt (5) protruded above the projection (11).

When the precast slab 200 is placed on the ground, the anchor bolts 5 penetrate the projecting portions 11 of the buried nuts 1 as well as the height adjusting bolts 2 and the support blocks 4. The threaded portion is formed on the upper outer surface of the anchor bolt 5. The threaded portion may be damaged in the process of passing the anchor bolt 5 through the height adjusting bolt 2 and the protrusion 11. [ In order to prevent the anchor bolt 5 from being damaged, the upper part of the anchor bolt 5 may be covered with a pipe-shaped anchor cap 51 if necessary. 9 is a schematic perspective view showing a state in which an anchor bolt 5 is covered with a pipe-shaped anchor cap 51, and FIG. 10 is a schematic half cross-sectional perspective view according to line EE of FIG. 9 And Fig. 11 is a schematic half cross-sectional perspective view showing a state after the anchor bolt 5 is covered with the anchor cap 51. As shown in Fig. The upper part of the anchor bolt 5 is inserted into the hollow of the anchor cap 51, as described above, so that the anchor bolt 51 5 are covered by the anchor cap 51. [0053] When the upper portion of the anchor bolt 5 is sequentially put on the support block 4, the height adjusting bolt 2 and the protruding portion 11 of the buried nut 1 in a state where the upper portion of the anchor bolt 5 is covered by the anchor cap 51, The screw portion formed in the anchor bolt 5 can be prevented from being damaged.

In particular, the anchor bolts 5 are subjected to compressive forces in the vertical direction during the temporary lifting of the precast slabs 200, so that buckling may occur in the anchor bolts 5. The upper part of the anchor bolt 5 is covered by the anchor cap 51 and the upper part of the anchor bolt 5 is reinforced to reduce the buckling length of the anchor bolt 5 and the risk of buckling is lowered Effect is exerted. In other words, the anchor cap 51 also exhibits a function of reinforcing the anchor bolt 5 and preventing buckling.

As described above, the anchor bolts 5 receive compressive force in the vertical direction during the temporary lifting of the precast slab 200. When the top surface of the anchor bolt 5 is not horizontal, A phenomenon that the vertical compression force does not act uniformly on the anchor bolt 5 may occur. If the anchor cap 51 is placed on the upper part of the anchor bolt 5 and the upper end surface of the anchor cap 51 is formed in the horizontal plane in advance, the vertical compressive force acts on the anchor bolt 5 evenly So that it is possible to effectively prevent the above problems.

When the anchor cap 51 is sequentially fitted on the support block 4, the height adjusting bolt 2 and the protruding portion 11 of the buried nut 1 in a state in which the anchor cap 51 is covered, It is also preferable that the upper end of the cap 51 is formed into a tapered shape so as to have a smaller sectional size as it goes upward. The shape of the top end of the anchor cap 51 may be tapered. However, as illustrated in the figure, the insertion guide 52 having a tapered shape whose cross section becomes smaller toward the upper end is inserted into the anchor cap 51 having a flat upper end surface It may be assembled and coupled. In this case, the upper surface of the insertion guide 52 is also flat. However, as mentioned above, the diameter of the hollow insertion portion 20 of the height adjusting bolt 2 through which the anchor bolt 5 is to pass and the diameter of the hollow 10 at the position where the projection 11 exists are smaller than the diameter of the anchor bolt 2. [ The anchor cap 51 and the insertion guide 52 may be omitted when the diameter of the anchor bolt 5 is sufficiently larger than the diameter of the anchor bolt 5 and the rigidity against buckling of the anchor bolt 5 is large. Of course, the anchor cap 51 and the insertion guide 52 can be omitted in other cases.

Next, a method of adjusting the height of the precast slab 200 using the height adjusting device 100 according to the embodiment of the present invention will be described. That is, the precast slab 200 is installed on the ground by using the height adjusting device 100 of the present invention, and the gap between the ground and the precast slab 200 is changed when necessary, The process of adjusting the installation height is explained. The method of adjusting the height of the precast slab 200 according to the present invention can be applied not only to the construction of the new concrete pavement but also to the repair of the old concrete pavement.

Figure 12 shows a schematic enlarged view of the circle F portion of Figure 1. As shown in the drawing, the precast slab 200 is manufactured so that the buried nuts 1 and the driver insertion tube 3 are embedded at a plurality of positions. In such a state that the buried nut 1 and the driver insertion tube 3 are embedded in the precast slab 200, the precast slab 200 passes through in the thickness direction, i.e., in the vertical direction. The height adjustment bolts 2 may be inserted into the buried nuts 1 in the bottom direction of the precast slab 200 after the buried nuts 1 are buried in the precast slabs 200. However, The hollow insertion portion 20 of the height adjusting bolt 2 is screwed into the hollow 10 at the lower portion of the vertical portion below the protruding portion 11 of the height adjusting bolt 2 so that the height of the filling nut 1 and the height adjusting bolt 2 It is more preferable to manufacture the precast slabs 200 so that the buried nuts 1 are embedded in the assembled state.

13 is a schematic cross-sectional view showing a process of installing a precast slab 200 using a height adjusting device 100 according to a first embodiment of the present invention and adjusting the installation height of the precast slab 200 Are shown.

13 (a), after the anchor bolt 5 is vertically installed on the paper surface 300 so that the lower end of the anchor bolt 5 is inserted and fixed on the paper surface 300, the support block 4 The anchor block 5 is passed through the center hole 40 of the support block 4 so that the concave curved surface of the support block 4 faces upward so that the support block 4 is placed on the ground surface 300 as shown in FIG. . Of course, in the case where the support block 4 is integrated with the height adjusting bolt 2, the process of installing the support block 4 separately on the ground surface 300 is omitted. The anchor cap 51 and the insertion guide 52 may be placed on the anchor bolt 5 in advance before the support block 4 is installed as shown in the figure. However, after the support block 4 is installed, It is preferable to cover the anchor cap 51 and the insertion guide 52. Of course, the anchor cap 51 and the insertion guide 52 may be omitted.

Followed by installing the precast slabs 200. 14 is a schematic half cross-sectional perspective view showing the relationship between the anchor bolt 5 and the height adjusting device 100 when the precast slab 200 is lifted. FIG. 15 is a cross- There is shown a schematic cross-sectional view sequentially showing the following processes.

When the pre-cast slab 200 is prepared with the buried nuts 1 and the driver insertion tube 3 being embedded and the height adjusting bolts 2 being coupled to the buried nuts 1, The precast slab 200 is lifted and positioned on the anchor bolt 5 and then lowered from the ground surface 300 so that the anchor bolt 5 is lifted down from the top of the height adjusting bolt 2 And is inserted into the center pipe through-hole 22.

14 shows a state in which the whole of the hollow insertion portion 20 of the height adjusting bolt 2 is inserted into the hollow 10 of the buried nut 1. The hollow insertion portion 20 of the height adjusting bolt 2, The precast slab 200 is lowered from the ground surface 300 downward and the anchor bolt 5 is moved downward from the hollow 10 of the embedding nut 1 by the height adjusting bolt 5, (22) of the main pipe (2).

When the precast slab 200 is lifted and transported over the ground surface 300 and then lowered down, as shown in FIG. 14, the two-ply hoisting device 6 is temporarily placed on the buried nuts 1 May be used in combination. The bracket assembly 6 shown in the figure is composed of a pair of braces 61 and a coupling portion 62 provided at a lower portion thereof and screwed to the buried nut 1. A threaded portion is formed on the outer surface of the engaging portion 62 and inserted into the hollow 10 of the buried nut 1 to be screwed. Therefore, the operator can bind the cable provided in the lifting device such as a crane to the inner ring 61 to easily lift, transport, and descend the precast slab 200. After the lifting and mounting operation of the precast slab 200 is completed, the engaging portion 62 is removed from the buried nut 1 to remove the double ring device 6. [

In the above description, the anchor bolt 5 is placed in the hollow of the buried nut 1 by lifting and mounting the precast slab 200 in a state where the anchor bolt 5 is previously installed on the ground surface 300 However, the present invention is not limited to this. That is, in a state where the height adjusting bolts 2 are coupled to the buried nuts 1 embedded in the precast slab 200, the precast slab 200 is lifted and the height adjusting bolts 2 are lifted up to the ground 300, The anchor bolt 5 may be vertically fixed to the paper surface 300 through the hollow 10 of the embedding nut 1. In this state, In this case, a perforation machine or the like is inserted through the hollow 10 of the buried nut 1 to form a perforation hole in the ground surface 300, and the anchor bolt 5 is inserted into the hollow 10 of the buried nut 1 So that the lower end of the anchor bolt 5 is fixed to the perforation hole.

If the support block 4 is separately provided from the height adjusting bolt 2 when the precast slab 200 is lifted and placed on the ground in the state where the anchor bolts 5 are not yet installed, 15 (b), when the precast block 4 is installed on the ground before the precast slab 200 is lifted / lowered, the bottom surface of the rotation driving portion 21 of the height adjusting bolt 2 The precast slab 200 is placed on the ground surface 300 in close contact with the upper surface of the support block 4. The anchor bolts 5 are arranged vertically but the supporting blocks 4 are arranged in the vertical direction in the structure in which the upper surface of the supporting block 4 and the lower surface of the rotary driving part 21 are formed of concave curved surfaces and convex curved surfaces having the same curvature, The lower surface of the rotation driving part 21 maintains a state of being in tight contact with the upper surface of the support block 4 even if the surface of the rotation driving part 21 is tilted at a predetermined angle due to the inclination of the ground surface 300, The load is transferred to the ground surface 300 in a dispersed state through the support block 4, smoothly.

The pre-cast slab 200 is temporarily lifted up to the required installation height. To this end, in the present invention, an impression jack device (7) temporarily fastened to a buried nut (1) and applying a compressive force to an anchor bolt (5) is used.

Fig. 16 is a schematic half cross-sectional perspective view showing a state in which the embedding nut 1 according to the present invention is engaged after the state shown in Fig. 15 (b) 17 (a) shows a schematic cross-sectional view of the state shown in Fig. As illustrated in the figure, the pull-up jack device 7 comprises a cylinder 70 and a piston 71 which moves back and forth in the cylinder 70 by hydraulic pressure or air pressure.

The cylinder 70 is formed with an inner weight, the upper end of which is closed and the lower end is open. The lower end of the pull-up jack device 7 is temporarily joined to the buried nut 1. To this end, a threaded portion is formed on the outer surface of the lower end of the cylinder 70. The piston 71 is inserted into the inner wall of the cylinder 70. When hydraulic or pneumatic pressure is applied to the space between the rear end of the piston 71 and the closed top face of the cylinder 70, The cylinder 70 advances toward the opened lower end portion of the cylinder 70.

 As described above with reference to FIGS. 15A and 15B, when the precast slab 200 is mounted on the ground, the anchor bolts 5 are inserted into the hollow 10 of the buried nuts 1 And the precast slab 200 is in a state of being supported by the height-adjusting bolts 2. In this case,

As shown in Figs. 16 and 17 (a), the pull-up jack device 7 is then engaged with the buried nuts 1. Fig. That is, the lower end of the cylinder 70 of the pull-up jack device 7 is inserted into the hollow 10 of the buried nut 1 and screwed thereto, thereby coupling the pull-up jack device 7 with the buried nut 1.

17 (b), when the piston 71 is moved in the lower open end direction of the cylinder 70 by applying oil pressure or air pressure to the pull-up jack device 7, the piston 71 is moved to the anchor bolt 5, while applying a compressive force to the anchor bolt 5. Since the anchor cap 51 is put on the upper part of the anchor bolt 5 and the anchor guide 52 is removed, the piston 71 does not directly touch the anchor bolt 5, So that the cap 51 comes into contact.

When the anchor bolt 5 is compressed in this manner, the precast slab 200 is lifted away from the paper surface 300 by using the compressive force as a reaction force. That is, when the piston 71 pushes the anchor bolt 5, the cylinder 70 rises upward relatively. The cylinder 70 is engaged with the buried nut 1, and the buried nut 1 is free Cast slabs 200 are embedded and integrated so that the precast slabs 200 are raised.

When the precast slab 200 is raised to a required design height, the height adjusting bolt 2 is advanced in the direction of the paper surface 300 so that the rotation driving part 21 of the height adjusting bolt 2 contacts the supporting block 4 . That is, the rotation driving unit 21 is rotated to move the height adjusting bolt 2 so that the hollow insertion unit 20 is pulled out from the buried nut 1. [

The rotation driver 30 is used in the present invention in order to rotate the rotation driving unit 21 so that the height-adjusting bolt 2 is moved downward by the rotation. 18 is a schematic half cross-sectional perspective view showing a state in which the rotary driver 30 is inserted into the driver insertion tube 3. In FIG. 19 (a), following the state shown in FIG. 18, 30 is a schematic cross-sectional view showing a state in which the gear teeth portion of the rotation driving portion 21 and the gear teeth portion of the rotation driving portion 21 are engaged with each other. FIG. 19 (b) Is a schematic cross-sectional view showing a state in which the lower portion of the first embodiment is advanced downward.

As shown in the drawing, the rotary driver 30 is a rod-shaped member, and at its lower end, a gear tooth portion 31 for engaging with a gear tooth portion of the rotary drive portion 21 is formed. The rotation driver 30 may be rotated by a power device such as an electric motor or may be manually rotated by an operator. However, in order to improve convenience when the rotary driver 30 is manually rotated, The grip portion 33 may be further provided at an upper end of the handle 30. As shown in Figs. 18 and 19 (a), the rod-shaped rotary driver 30 is inserted into the driver insertion tube 3 in order to rotate the rotary driver 21. [ 19 (a), the lower end of the rotation driver 30 where the gear teeth 31 are formed reaches the rotation drive portion 21, and the gear teeth of the rotation drive portion 21 and the rotation driver 30 to engage the gear teeth 31 with each other.

When the operator rotates the rotation driver 30, the rotation driving unit 21 rotates and the height adjusting bolt 2 moves downward while rotating. As a result, as shown in FIG. 19 (b) The rotation driving portion 21 of the bolt 2 is brought into contact with the support block 4. [ The pre-cast slab 200 maintains the height of the raised lifting jacket 7 using the lifting jack device 7 as it is. That is, the precast slab 200 is supported by the height-adjusting bolts 2 so as to maintain the height of the elevation raised by the impression jack device 7.

Particularly, in the present invention, since the height of the height adjusting bolt 2 is increased by protruding from the lower surface of the precast slab 200 by rotating the rotary driver 30, the degree of rotation of the rotary driver 30 The installation height of the precast slab 200 can be further minutely increased. That is, it is possible to precisely adjust the installation height of the precast slab 200 so as to exactly match the design details, and such precise adjustment work can be carried out very easily.

20 is a schematic cross-sectional view sequentially showing a process progressing subsequent to the state shown in FIG. 19, and FIG. 21 shows a state in which the closing cap 41 is covered after the state shown in FIG. 20 (a) Sectional perspective view showing the state of the semiconductor device. When the precast slab 200 is supported by the height adjusting bolts 2 to maintain the installation height, the impression jack device 7 is removed from the embedding nut 1 and the anchor cap 51 The nut member 53 is fastened to the upper end of the anchor bolt 5 protruded above the protruding portion 11 as shown in Figure 20 (a) after removing the rotary drive 30 by removing it from the anchor bolt 5, do. At this time, it is preferable that the nut member 53 fastened to the anchor bolt 5 is positioned in close contact with the protruding portion 11. The nut member 53 is fastened to the upper end of the anchor bolt 5 and the nut member 53 is disposed in close contact with the protruding portion 11 so that an unillustrated pulling force acts on the precast slab 200, It is possible to effectively prevent the slab 200 from being lifted above the installation height. However, it is not essential to fasten the nut member 53 to the anchor bolt 5. That is, the nut member 53 may not be inserted into the anchor bolt 5 if necessary.

20 (c), the upper portion of the open hollow 10 of the buried nuts 1 is closed with a finishing cap 41 to prevent the inflow of foreign matter. It is preferable to select the finishing cap 41 having a sufficiently large diameter so as to prevent foreign matter from flowing into the driver insertion tube 3 by blocking the upper inlet of the driver insertion tube 3. It is of course possible to additionally include an additional finishing cap for closing the upper inlet of the driver insertion tube 3, apart from the finishing cap for closing the hollow 10 of the buried nut 1.

It is possible to prevent the precast slab 200 from being deformed due to the load acting on the precast slab 200 including the own weight of the precast slab 200 in a state in which the precast slab 200 is installed at a vertical interval from the surface 300 The load is transmitted to the ground surface 300 through the buried nut 1, the height adjusting bolt 2, and the support block 4.

When the height of the ground surface 300 is changed due to subsidence or the like after the installation of the precast slab 200 according to the designed installation height, the present invention having the above- It is possible to adjust the height of the mounting portion 200 according to the height change of the ground. Next, a method of adjusting the height of the precast slab according to the present invention, which is performed when sinking or ridging occurs on the ground, will be described in detail.

In the method of adjusting the height of the precast slab according to the present invention, the rotation driver 30 is inserted into the driver insertion tube 3 so that the rotation driver 30 and the rotation drive unit 21 The height adjusting bolt 2 is rotated by the rotation of the rotation driver 30 so as to protrude further from the buried nuts 1 in the direction of the paper surface 300 in a state in which the pre-cast slab 200). Since the load transmitted from the precast slab 200 is already applied to the height adjusting bolt 2 and the rotational driving unit 21 is tightly in close contact with the supporting block 4, the rotational driving unit 30 It is not easy to turn the height adjusting bolt 2 downward by rotating the bolts 21. The closure cap 41 and the nut member 53 fastened to the anchor bolt 5 are removed and the pulling jack device 7 is again engaged with the embedding nut 1. Thereafter, The piston 71 is protruded from the cylinder 70 by applying hydraulic pressure or air pressure to the front wall of the anchor bolt 5 to apply a compressive force to the anchor bolt 5 to pull the precast slab 200 back to its original design height.

The rotary driver 30 is inserted into the driver insertion tube 3 so that the rotary driver 30 and the rotary drive unit 21 are engaged with each other while the precast slab 200 is restored to its original design height and restored, The height adjusting bolt 2 is rotated by the rotation of the rotary driver 30 so as to protrude from the buried nut 1 in the direction of the paper surface 300 so that the rotation driving portion 30 is brought into close contact with the support block 4, And the restored precast slab 200 is firmly supported by the height adjusting bolts 2 to maintain the restored state. The anchor cap 51 is also removed from the anchor bolt 5 and the anchor bolt 5 protruded above the protrusion 11 is removed from the anchor bolt 5, The nut member 53 is fastened to the upper end portion of the cover member 41, and a finishing cap 41 is installed.

As described above, in the present invention, even if the installation height of the precast slab 200 is lowered due to settlement of the ground 300, the operator does not directly approach the gap between the ground 300 and the precast slab 200, The installation height of the precast slab 200 can be easily restored to the designed position at the time of the original construction simply by operating the upper surface of the precast slab 200 only. When the installation height of the precast slab is lowered due to the settlement of the ground, the prior art has no choice but to remove the precast slab and install the new precast slab again or to apply the concrete overlay on the precast slab. There is a disadvantage in that a large amount of time and cost are involved, and a problem of detachment of the overlaid concrete due to the overlaying of the top surface of the precast slab. However, the disadvantages and problems of the related art are not generated at all in the present invention.

According to the method of adjusting the height of the precast slab 200 according to the present invention, even when the ground 300 rises, the installation height of the precast slab 200 can be easily changed from the originally constructed state, that is, It can be restored.

The finishing cap 41 and the nut member 53 fastened to the anchor bolt 5 can be prevented from being damaged when the pre-cast slab 200 is protruded upward beyond the installation height when the pre- And the piston 71 is protruded from the cylinder 70 by applying oil pressure or air pressure to the pulling jack device 7 after the impression jack device 7 is coupled with the buried nut 1 again so as to be attached to the anchor bolt 5 The precast slab 200 is lifted by applying a compressive force so that a gap is generated between the rotary drive unit 21 and the support block 4 or at least the rotary drive unit 21 is rotated so that the rotary drive unit 21 can rotate easily. And the support block (4).

In this state, the rotation driver 30 is inserted into the driver insertion tube 3 so that the rotation driver 30 and the rotation drive unit 21 are engaged with each other, and the rotation drive unit 21 is rotated The height adjusting bolt 2 is moved in the direction of the buried nut 1 to be further inserted and contracted and then the hydraulic pressure or the air pressure applied to the pulling jack device 7 is reduced so that the piston 71 is returned to the cylinder 70 So that the precast slab 200 is lowered again to restore the designed installation height. Subsequently, the rotation driver 30 is driven to lower the height adjusting bolt 2 again so that the rotation driving part 21 is brought into close contact with the base block 4, thereby raising the original height to the original height and restoring the precast slab 200 are firmly supported by the height adjusting bolts 2 to maintain the restored state. The anchor cap 50 is also removed from the anchor bolt 5 and the upper end of the anchor bolt 5 protruded above the protrusion 11 is removed The nut member 53 is fastened, and a finishing operation for installing the finishing cap 41 is performed.

As described above, in the present invention, even if the installation height of the precast slab 200 rises due to the elevation of the ground surface 300, as in the case of lowering of the ground surface, the operator is able to adjust the distance between the ground surface 300 and the precast slab 200 The installation height of the precast slab 200 can be easily restored to the designed position at the time of the original construction without any direct approach, only by the operation on the top surface of the precast slab 200.

In the present invention, if the shape of the buried nuts 1 is mirror-symmetrical with respect to the vertical direction, the precast slab 200 can be reversed and reused as necessary. That is, when the shape of the buried nuts 1 is mirror-symmetrical in the vertical direction and downward, for example, if the top surface of the precast slab 200 is aged and becomes excessively rough, the precast slab 200 is turned upside down, It is possible to easily arrange it so as to reach the design height again in such a state as to be the upper surface.

1: Recessed nut
2: Height adjustment bolt
3: Insertion guide
4: Base block
5: Anchor bolt
10: hollow
11: protrusion
12: Shear connection
20: hollow insertion part
21:
25: Through hole
30: Rotary driver
31: gear tooth portion
40: center hole
50: anchor cap
51: Insertion guide

Claims (7)

A buried nut 1 which is vertically erected and embedded in the precast slab 200 and has a hollow 10 formed on the inner surface thereof with a threaded portion;
A hollow insertion portion 20 which is inserted into the hollow portion 10 of the buried nut 1 in a state of being threadedly engaged with the vertical portion of the hollow insertion portion 20 and a gear tooth portion formed integrally with a lower end portion of the hollow insertion portion 20, A height adjusting bolt (2) comprising a rotation driving part (21) and having a central pipe through hole (22) formed at its center so as to penetrate both the hollow insertion part (20) and the rotation driving part (21);
The slab 200 is formed of a pipe member so as to be able to advance and retract the height adjusting bolt 2 by rotating the rotation driving unit 21 by inserting the rotary driver 30 on the upper surface of the precast slab 200, A driver insertion tube (3) integrally embedded in the body (200);
And an anchor bolt (not shown) inserted through the central hole 22 of the height adjusting bolt 2 and the hollow 10 of the buried nut 1 5); And
A cylinder 70 in which an upper end is closed and a lower end is opened and a cylinder 70 in which an inner cylinder is opened and which is disposed in the inner cylinder of the cylinder 70, And a piston 71 that advances toward the opened lower end and contacts the upper end surface of the anchor bolt 5 to apply a compressive force to the anchor bolt 5. The lower end of the piston 71 is temporarily engaged with the buried nut 1 An impression jack device (7);
The anchor bolt 5 is inserted through the central pipe passage 22 and the hollow 10 and the hollow insertion portion 20 of the height adjusting bolt 2 is inserted into the hollow 10 of the hollow nut 1 A pressure is applied to the inside of the cylinder 70 so that the piston 71 is moved to the open lower end of the cylinder 70 in the state where the impression jack device 7 is engaged with the buried nut 1 So that the anchor bolts 5 are pressed against the upper surface of the anchor bolts 5 so that the buried nuts 1 and the precast slabs 200 are lifted, The rotation driver 30 is inserted into the driver insertion tube 3 and the rotation driving part 21 is rotated by the rotation driver 30 so that the height adjusting bolt 2 is rotated so that the hollow insertion part 20 is rotated by the filling nut 1 So that the lower end of the height adjusting bolt 2 is supported on the ground, and the height adjusting bolt 2 and the buried nut 1 The precast slabs 200 are supported at a vertical interval from the ground, and the pull-down jack device 7 is detached from the buried nuts 1 and removed;
When the height adjustment of the precast slab 200 is required, the pull-up jack device 7 is again engaged with the buried nuts 1 and pressure is applied to the inside of the cylinder 70, 70 and presses the anchor bolt 5 against the upper end surface of the anchor bolt 5 to apply a compressive force to the buried nut 1, the precast slab 200 and the height adjusting bolts 2 The rotation driver 30 is inserted from the upper surface of the precast slab 200 through the driver insertion tube 3 so that the gear teeth of the rotary driver 30 and the gear teeth of the rotary drive 21 The height adjustment bolt 2 is rotated and rotated in the vertical direction by rotation of the rotary driver 30 in the engaged state so that the installation height of the precast slab 200 is adjusted and then the height adjustment bolt 2 and the buried nut 1 The pre-cast slab 200 may have a height adjusted by the pre- A height adjuster of the precast slab, characterized in that the support stay.
The method according to claim 1,
Wherein the driver insertion tube (3) is provided in a state of being closely attached to a side surface of the buried nut (1).
The method according to claim 1,
In order to prevent the screw part from being damaged when the anchor bolt 5 is inserted through the hollow 10 and the central pipe through hole 22 and to prevent buckling of the anchor bolt 5 by reinforcing the anchor bolt 5, The anchor bolts 5 are inserted into the hollow 10 and the central pipe passage 22 to be inserted into the hollow pipe 10 and the central pipe passage 22, Further comprising an anchor cap (51) which is removed after the cast slab (200) is spaced from the ground (300).
The method of claim 3,
In order to allow the anchor bolt 5 to be easily inserted into the hollow 10 and the central pipe through-hole 22 in a state that the anchor cap 51 is covered, the upper end of the anchor cap 51 is tapered And an insertion guide (52) having a flat top surface is further assembled and coupled to the pre-cast slab.
5. The method according to any one of claims 1 to 4,
And a center hole 40 through which the anchor bolts 5 pass is formed at the center of the center hole 40. The center hole 40 is disposed on the ground surface so that the rotation driving portion 21 of the height adjusting bolt 2 is positioned at the center, Further comprising a support block (4) for distributing the load from the precast slab transferred through the height adjusting bolt (2) to the ground, Device.
6. The method of claim 5,
In the support block 4, the upper surface to which the rotation driving portion 21 is closely attached is formed of a concave curved surface;
Wherein a lower surface of the rotation driving unit (21) which is in close contact with the support block (4) is formed of a convex curved surface having a curvature equal to the curvature of the concave curved upper surface of the support block (4). A method of adjusting a height of a precast slab (200) installed in a state where the precast slab (200) is installed so as to be spaced apart from the ground,
The pre-cast slab (200) is provided with a buried nut (1) having a hollow (10) with a threaded portion formed on its inner surface and buried in a vertical position;
The hollow insertion portion 20 and the rotation driving portion 21 are integrally formed at the lower end of the hollow insertion portion 20 and have a rotation driving portion 21 having a gear tooth portion on its lateral side. The height adjusting bolt 2 in which the center pipe through hole 22 is formed at the center portion is inserted into the hollow portion 10 of the buried nut 1 in a state of being screwed on the vertical lower portion of the hollow insertion portion 20 , Coupled with the buried nut (1);
A driver insertion tube 3 formed of a pipe member is vertically installed and embedded in the precast slab 200;
The anchor bolt 5 made of a rod-shaped member is vertically erected with the lower end thereof penetratingly fixed on the ground so that the central hole 22 of the height adjusting bolt 2 and the hollow 10 of the buried nut 1, ;
The lower end of the impression jack device 7 is temporarily connected to the buried nut 1. The impression jack device 7 has a cylinder 70 in which an upper end is closed and an upper end is opened, And an anchor bolt 5 which is disposed in the inner hollow of the cylinder 70 and advances toward the open lower end of the cylinder 70 in the cylinder 70 by hydraulic pressure or air pressure so as to contact the upper surface of the anchor bolt 5, And a piston (71) for applying a compressive force to the piston (5);
The anchor bolt 5 is inserted through the central pipe passage 22 and the hollow 10 and the hollow insertion portion 20 of the height adjusting bolt 2 is inserted into the hollow 10 of the hollow nut 1 And the piston 71 is urged toward the open lower end of the cylinder 70 by applying pressure in the inner middle of the cylinder 70 while the impression jack device 7 is engaged with the buried nut 1 The buried nut 1 and the precast slab 200 are lifted by applying a compressive force to the anchor bolt 5 so as to contact the upper surface of the anchor bolt 5 to advance the precast slab 200 from the upper surface of the precast slab 200 The rotation driver 30 is inserted into the driver insertion tube 3 and the rotation driving part 21 is rotated by the rotation driver 30 so that the height adjusting bolt 2 is rotated so that the hollow insertion part 20 is inserted into the buried nut 1, So that the height adjustment bolt 2 is supported on the ground at the lower end, and the height adjustment bolt 2 and the embedding nut 1, the precast slabs 200 are supported at regular intervals from the ground;
After the precast slabs 200 are supported, the pull-down jack device 7 is removed from the buried nuts 1 and removed;
When the height adjustment of the precast slab 200 is required, the pull-up jack device 7 is again engaged with the buried nut 1 and pressure is applied to the inside of the cylinder 70 to move the piston 71 to the cylinder 70 The precast slab 200 and the height adjusting bolt 2 are moved upward by applying a compressive force to the anchor bolt 5 while contacting the upper end surface of the anchor bolt 5, The rotary screwdriver 30 is inserted from the upper surface of the precast slab 200 through the driver insertion tube 3 so that the gear teeth of the rotary driver 30 and the gear teeth of the rotary drive part 21 are engaged The height adjustment bolt 2 is rotated by the rotation of the rotary driver 30 so as to vertically advance and retreat so that the installation height of the precast slab 200 is adjusted and then the height adjustment bolt 2 and the embedding nut 1 The precast slab 200 maintains the adjusted height And the slabs are supported by the slabs.

Images